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We are entering our first cold season in a brownstone (after living in overheated apts for the past 20 yrs) and in addition to flannel sheets and fuzzy slippers, are considering winterizing our drafty, 20-yr old windows. Came across this product–3M 2141W Indoor 5-Window Insulator Kit–online and was wondering if anyone has tried it on windows with original wood frames that are stained and varnished. Our concern is that the double-sided tape will damage the wood finish. Thanks for sharing any experiences with the product or any other handy insulating drafty window tips.